Tzanakaki A, Anastasopoulos M, Georgakilas K, Landi G, Bernini G, Ciulli N, Riera JF, Escalona E, Garcia-Espin JA, Hesselbach X, et al. Planning of dynamic virtual optical cloud infrastructures: The GEYSERS approach. IEEE Communications Magazine [Internet]. 2014;52(1):26 - 34.